8Biezunski, M. Bryan, M., & Newcomb,(1999).ISO/IEC FCD 13250:1999-Topic Maps.<http://www.rnol.gov/sgml/sc34/document/0058.htm>(1 Oct,200)
9Freese, Eric. Using Topic Maps: for the representation, management & discovery of knowledge". XML Europe 2000, Paris, 12-16 Jun., 2000.<http://www.gca.org/papers/xmleurope2000/papers/s22-01 .html>(27 Dec., 2002).
10M. Biezunski, S. Neweomb, and M. Bryan. "ISO/IEC JTC 1/SC34 N323 Guide to the topic map standards". 23 Jun., 2002. <http://www.y12.doe.gov/sgml/se34/doeument/0323.htm > (17 Mar., 2003).